FLEX 24V Brushless Cordless 4-Tool Combo Kit Review: A Professional’s Take on the FXM402-2B

When we first unboxed the FLEX 24V Brushless Cordless 4-Tool Combo Kit (FXM402-2B), we weren’t expecting much fanfare—just another power tool combo competing for garage space. But after three months of rigorous testing across multiple job sites and DIY projects, this kit has fundamentally changed our perspective on what a mid-range cordless tool system can deliver.

The FLEX brand might not have the household name recognition of some competitors, but this 4-tool combo kit proves that innovation and performance matter more than legacy branding. Whether you’re a professional contractor looking to expand your cordless arsenal or a serious DIYer ready to graduate from entry-level tools, our hands-on experience reveals why this kit deserves your serious consideration.

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What’s Actually in the Box: First Impressions That Matter

Unpacking the FLEX FXM402-2B feels like Christmas morning for tool enthusiasts. The kit arrives thoughtfully organized in a sturdy cardboard box, and everything we pulled out showed attention to quality:

• 24V Brushless Circular Saw (6-1/2″) – Lighter than we anticipated, with an ergonomic grip that immediately felt balanced
• 24V Brushless Reciprocating Saw – Featuring a tool-free blade change system we actually used (no fumbling for Allen keys)
• 24V Fixed Speed Angle Grinder (4-1/2″) – Compact profile that impressed us with its narrow motor housing
• 24V Brushless Drill Driver – The workhorse of the bunch, with a responsive variable speed trigger
• Two Lithium Batteries – One 2.5Ah and one 5.0Ah, giving you runtime options
• 160W Rapid Charger – Fast charging that actually lives up to its billing
• Auxiliary Handle – Compatible with multiple tools for enhanced control
• Blade Guards and Basic Accessories – Everything needed to start working immediately

What struck us immediately was the build quality. These don’t feel like budget tools masquerading as professional equipment. The housings are robust polymer with rubberized grips, and the motor venting appears designed for longevity rather than cost-cutting.

The 24V Brushless Platform: Why This Battery System Impressed Us

We’ve tested dozens of cordless platforms, and voltage alone doesn’t tell the whole story. FLEX’s 24V system positions itself in a sweet spot—more powerful than standard 18V/20V MAX systems, yet more compact and affordable than 40V+ heavy-duty platforms.

Battery Performance in Real-World Conditions

During our testing, we ran both batteries through demanding applications:

The 5.0Ah Battery: We installed it in the circular saw and made continuous cuts through pressure-treated 2×10 lumber. We completed 47 cuts before the battery needed recharging—enough to frame a small deck section without swapping batteries. In the drill driver, this battery provided all-day runtime for typical drilling and driving tasks.

The 2.5Ah Battery: Don’t dismiss this smaller pack as an afterthought. Its reduced weight makes it ideal for overhead work or extended drilling sessions where fatigue becomes a factor. We used it primarily with the drill driver and reciprocating saw for lighter applications, and appreciated how it kept tools noticeably lighter without sacrificing much runtime.

The 160W charger deserves special mention. FLEX claims the 5.0Ah battery charges in 60 minutes, and our timed tests confirmed this—58 minutes from completely depleted to full charge. The 2.5Ah pack charged in approximately 28 minutes. These aren’t inflated marketing numbers; this charger genuinely delivers rapid turnaround times.

Tool-by-Tool Performance: Our Hands-On Testing Results

The 6-1/2″ Circular Saw: Precision Meets Power

This circular saw became our go-to tool faster than we expected. The 6-1/2″ blade size initially seemed like a compromise—smaller than standard 7-1/4″ saws—but it proved perfectly capable for the vast majority of cutting tasks.

What we loved: The brushless motor delivers surprising torque. We made bevel cuts through engineered lumber without bogging down, and the saw maintained consistent blade speed even in challenging materials. The electric brake stops the blade within two seconds of releasing the trigger—a safety feature we genuinely appreciated.

The depth and bevel adjustments use sturdy metal levers that locked securely without requiring excessive force. After weeks of job site dust exposure, these adjustments still operated smoothly without binding.

Cutting capacity: At 90 degrees, this saw cuts 2-1/8″ deep—sufficient for cutting through double stacked 2x material. The bevel capacity reaches 50 degrees, and we found the angle markings accurate when checked against a digital protractor.

One consideration: If you regularly cut deeper stock or full sheets of plywood, you might occasionally miss the extra capacity of a 7-1/4″ saw. For us, the reduced weight and improved maneuverability more than compensated for the occasional limitation.

The Reciprocating Saw: Demolition Power in a Compact Package

Reciprocating saws live hard lives, and we intentionally subjected this one to abuse: cutting nail-embedded lumber, slicing through cast iron pipe, and demolishing an old deck.

The tool-free blade clamp worked flawlessly throughout our testing. We changed blades dozens of times, often with gloves on in cold weather, and never experienced a blade slip or ejection. The clamp mechanism feels robust—nothing like the flimsy quick-release systems we’ve encountered on budget recip saws.

Stroke characteristics: With a 7/8″ stroke length and variable speed trigger, this saw provides excellent control. We could finesse cuts near plumbing without aggressive blade action, then dial up the speed for rapid demolition work. The brushless motor maintained consistent strokes per minute even under heavy load.

Anti-vibration engineering actually works on this model. Extended cutting sessions didn’t leave our hands tingling like some recip saws we’ve used. The rubberized front grip and balanced weight distribution contribute to reduced user fatigue.

Our toughest test: We cut through a glue-laminated beam containing multiple nails. The saw powered through, though we could feel the motor working hard. After this torture test, we inspected the internal components—no unusual wear or heat damage. This saw is built to handle professional abuse.

The 4-1/2″ Angle Grinder: Fixed Speed with Purpose

The fixed-speed angle grinder sparked initial skepticism from our team. Variable speed grinders offer more versatility, so why did FLEX opt for single-speed operation?

After extensive use, we understand the design philosophy. This grinder runs at 8,500 RPM—optimized for metal cutting and grinding applications where consistent, high-speed rotation matters most. The absence of variable speed electronics likely contributes to the tool’s compact size and apparent durability.

Performance testing: We used this grinder with cutting wheels, grinding discs, and flap discs across various materials. Cutting through 1/4″ steel plate required multiple passes but proceeded smoothly without motor strain.